137 lines
4.2 KiB
Go
137 lines
4.2 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kernel
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import (
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"testing"
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"gvisor.dev/gvisor/pkg/sentry/fs/filetest"
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"gvisor.dev/gvisor/pkg/sentry/kernel/kdefs"
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"gvisor.dev/gvisor/pkg/sentry/limits"
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)
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const (
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// maxFD is the maximum FD to try to create in the map.
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// This number of open files has been seen in the wild.
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maxFD = 2 * 1024
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)
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func newTestFDMap() *FDMap {
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return &FDMap{
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files: make(map[kdefs.FD]descriptor),
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}
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}
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// TestFDMapMany allocates maxFD FDs, i.e. maxes out the FDMap,
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// until there is no room, then makes sure that NewFDAt works
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// and also that if we remove one and add one that works too.
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func TestFDMapMany(t *testing.T) {
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file := filetest.NewTestFile(t)
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limitSet := limits.NewLimitSet()
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limitSet.Set(limits.NumberOfFiles, limits.Limit{maxFD, maxFD}, true /* privileged */)
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f := newTestFDMap()
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for i := 0; i < maxFD; i++ {
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if _, err := f.NewFDFrom(0, file, FDFlags{}, limitSet); err != nil {
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t.Fatalf("Allocated %v FDs but wanted to allocate %v", i, maxFD)
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}
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}
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if _, err := f.NewFDFrom(0, file, FDFlags{}, limitSet); err == nil {
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t.Fatalf("f.NewFDFrom(0, r) in full map: got nil, wanted error")
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}
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if err := f.NewFDAt(1, file, FDFlags{}, limitSet); err != nil {
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t.Fatalf("f.NewFDAt(1, r, FDFlags{}): got %v, wanted nil", err)
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}
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}
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// TestFDMap does a set of simple tests to make sure simple adds,
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// removes, GetRefs, and DecRefs work. The ordering is just weird
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// enough that a table-driven approach seemed clumsy.
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func TestFDMap(t *testing.T) {
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file := filetest.NewTestFile(t)
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limitSet := limits.NewLimitSet()
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limitSet.Set(limits.NumberOfFiles, limits.Limit{1, maxFD}, true /* privileged */)
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f := newTestFDMap()
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if _, err := f.NewFDFrom(0, file, FDFlags{}, limitSet); err != nil {
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t.Fatalf("Adding an FD to an empty 1-size map: got %v, want nil", err)
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}
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if _, err := f.NewFDFrom(0, file, FDFlags{}, limitSet); err == nil {
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t.Fatalf("Adding an FD to a filled 1-size map: got nil, wanted an error")
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}
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largeLimit := limits.Limit{maxFD, maxFD}
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limitSet.Set(limits.NumberOfFiles, largeLimit, true /* privileged */)
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if fd, err := f.NewFDFrom(0, file, FDFlags{}, limitSet); err != nil {
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t.Fatalf("Adding an FD to a resized map: got %v, want nil", err)
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} else if fd != kdefs.FD(1) {
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t.Fatalf("Added an FD to a resized map: got %v, want 1", fd)
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}
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if err := f.NewFDAt(1, file, FDFlags{}, limitSet); err != nil {
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t.Fatalf("Replacing FD 1 via f.NewFDAt(1, r, FDFlags{}): got %v, wanted nil", err)
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}
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if err := f.NewFDAt(maxFD+1, file, FDFlags{}, limitSet); err == nil {
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t.Fatalf("Using an FD that was too large via f.NewFDAt(%v, r, FDFlags{}): got nil, wanted an error", maxFD+1)
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}
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if ref := f.GetFile(1); ref == nil {
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t.Fatalf("f.GetFile(1): got nil, wanted %v", file)
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}
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if ref := f.GetFile(2); ref != nil {
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t.Fatalf("f.GetFile(2): got a %v, wanted nil", ref)
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}
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ref, ok := f.Remove(1)
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if !ok {
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t.Fatalf("f.Remove(1) for an existing FD: failed, want success")
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}
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ref.DecRef()
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if ref, ok := f.Remove(1); ok {
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ref.DecRef()
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t.Fatalf("r.Remove(1) for a removed FD: got success, want failure")
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}
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}
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func TestDescriptorFlags(t *testing.T) {
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file := filetest.NewTestFile(t)
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f := newTestFDMap()
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limitSet := limits.NewLimitSet()
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limitSet.Set(limits.NumberOfFiles, limits.Limit{maxFD, maxFD}, true /* privileged */)
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origFlags := FDFlags{CloseOnExec: true}
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if err := f.NewFDAt(2, file, origFlags, limitSet); err != nil {
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t.Fatalf("f.NewFDAt(2, r, FDFlags{}): got %v, wanted nil", err)
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}
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newFile, newFlags := f.GetDescriptor(2)
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if newFile == nil {
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t.Fatalf("f.GetFile(2): got a %v, wanted nil", newFile)
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}
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if newFlags != origFlags {
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t.Fatalf("new File flags %+v don't match original %+v", newFlags, origFlags)
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}
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}
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